The upper respiratory system is infected in the common cold. It is caused by a viral infection which primarily involves the rhinoviruses and coronaviruses. The common cold is the most common infection in humans today. The average person contracts it at least once a year and often more than that.
It usually takes the virus about two to six hours before it starts replicating in the human body. Symptoms will usually start showing up a few days after this. Research demonstrates that the symptoms may begin as early as 10 hours after initial infection. There is not a cure for the common cold, but the body is usually able to get rid of it in 7 to 10 days.
Infection usually starts when there is contact to the eyes, nose or mouth with the virus. This is often the result of touching these areas with our hands. Washing your hands regularly can help to prevent the cold. You should be aware of objects and surfaces that others have touched who are infected with the cold. Studies now demonstrate that viruses can live longer on objects than originally thought in the past.